Does stress cause urticaria? my fianc has high blood pressure and could sleep at night. how does she go about it at least to be able to sleep.

Urticaria: Hives are generally not caused by stress but can be aggravated by stress. They can be from medications, or viral or of unknown origin to name a few causes. If they are bothering her, she can try Allegra (fexofenadine) or zyrtec and these don't help, she can see an allergist to figure it out.

Yes: Stress can indeed cause urticaria. If your fiance cannot sleep because of itching from the hives, try taking antihistamine up to every 6 hrs to see if it helps. If not, she should see her doctor.